A "disgruntled" designer, who was sacked from an apparel company, shot dead a former co-worker and then randomly opened fire on the crowded sidewalks outside the iconic Empire State Building here today, the third such incident in the US in nearly one month. The gunman has been identified as Jeffrey Johnson, 53, who had worked as a designer of women's accessories at apparel firm Hazan Imports for six years. He was laid off from his job a year ago when the company underwent downsizing.